Thermal Transfer Printer Ribbon Speed Control
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Solution Overview
Problem
Conventional thermal transfer printers face issues with ribbon distortion and print quality due to the need for synchronized ribbon and substrate speeds, which compromises print quality for ribbon usage efficiency.
Innovation Solution
The method involves controlling the ribbon speed to be less than the print speed, with specific percentages such as 95% to 99% of the print speed, to reduce ribbon distortion and improve print quality by allowing relative movement between the ribbon and substrate, while maintaining efficient ribbon usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the ribbon speed is reduced to improve ribbon control and reduce ribbon trauma, then print quality is improved, but ribbon usage efficiency deteriorates
Solution Approach 1:
The patent applies parameter changes by adjusting the ribbon speed to be less than the print speed (specifically between 0.5x and 0.9x of print speed) rather than maintaining equal speeds. This parameter modification resolves the contradiction by optimizing ribbon control and reducing ribbon trauma while accepting a controlled reduction in ribbon usage efficiency, thereby improving print quality without completely sacrificing productivity.
2Productivity
If the ribbon speed is reduced significantly to achieve ribbon savings, then ribbon usage efficiency is improved, but print quality deteriorates
Solution Approach 1:
The patent establishes an optimal parameter range for ribbon speed (0.5x to 0.9x of print speed) that balances ribbon usage efficiency with print quality. By defining this specific range rather than using extreme reductions, the invention achieves ribbon savings while preventing the deterioration of print quality that would occur with excessive speed reduction.
3Ease of operation
If the ribbon speed is made equal to the print speed for synchronized movement, then ribbon control is simplified, but ribbon distortion and trauma increase
Solution Approach 1:
The patent changes the operational parameter from equal speeds (ribbon speed = print speed) to a differentiated speed relationship (ribbon speed < print speed). This parameter change, while adding some complexity to speed coordination, effectively reduces ribbon distortion and trauma by allowing the ribbon to move at an optimized speed that prevents excessive tension and deformation during the printing process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances print quality by reducing ribbon distortion and sagging, leading to improved image transfer and reduced ribbon trauma, while also achieving significant ribbon savings.
Implementation Method 1
The printhead contains printing elements which, when heated, whilst in contact with the ribbon, cause ink to be transferred from the ribbon and onto the substrate
Data Source
AI summary
A method of operating a thermal transfer printer, the thermal transfer printer comprising first and second spool supports each being configured to support a spool of ribbon; a ribbon drive configured to cause movement of ribbon from the first spool support to the second spool support along a predetermined ribbon path; and a printhead. The printhead is moveable towards and away from a printing surface, and, during printing, is configured to selectively transfer ink from the ribbon to a substrate as the substrate and printhead are moved relative to one another at a print speed. The method comprising causing relative movement between the ribbon and the printhead at a ribbon speed. A relative speed of movement between the ribbon and the substrate during printing is controlled based upon a force exerted upon the ribbon by the printhead during a printing operation, and/or a parameter indicative of an area of contact between a portion of the printhead and a portion of the printing surface.